Kantzos, a 17-year Arlington police veteran, was being held in Tarrant County Jail on federal charges of fraud and related activity in connection with computers.

Another three-year veteran, Officer Craig Hermans, 34, was being questioned in connection with the criminal investigation.

Hermans, like Vo and Kantzos, has been placed on administrative leave.

Details about the charges were not available. FBI spokeswoman Katherine Chaumont declined to comment further. Federal officials and the Texas Department of Public Safety teamed up on the investigation.

Last month, Arlington police tweeted a photo of Vo being interviewed by a Saigon television crew. A December tweet by the Police Department identified Kantzos as a patrol training officer.

In a news release, police spokeswoman Tiara Richard said the department is “deeply disturbed” by the allegations and cooperated fully with the federal and state investigation.

The news release also said the officers’ actions are not indicative of the 800-employee agency’s values.

“Criminal misconduct by our employees is intolerable as it damages the trust and confidence of those we serve,” Police Chief Will D. Johnson said in the written statement. “We will always aggressively pursue the arrest and prosecution of any employee engaged in this sort of behavior.”